Chapter 5: Using Your Filtered Enclosure and Appropriate Application
PRODUCT. IT IS THE USER’S
RESPONSIBILITY TO BECOME AWARE OF
LOCAL REGULATIONS GOVERNING THE
SAFE USE AND DISPOSAL OF CHEMICALS,
CARBON AND HEPA FILTERS. KNOWLEDGE
OF ESTABLISHED SAFE EXPOSURE LEVELS
IS IMPERATIVE TO THE PROPER USE OF
FILTERED ENCLOSURES.
Definition of Terms
NIOSH – National Institute for Occupational Safety and
Health/Mine Safety and Health Administration. (U.S.A.)
TWA – Recommended Exposure Limits expressed as a Time Weighted Average. The exposure limit for that chemical for up to a
Odor Threshold – The value in parts per million or milligrams per cubic meter for which one might expect to smell a chemical’s presence in the air. This value is very subjective and detection will vary with the sensitivity of one’s nose. The period of time until the odor threshold is reached in the exhaust stream can be estimated from Labconco exclusive computerized filter modeling program. Contact Labconco on carbon filter life for specific applications. See Chapter 6.
Saturation Level or Time – There is a limit to the amount of chemical that can be adsorbed by activated carbon, or neutralized by
IDLH (Immediately Dangerous to Life and Health). An atmosphere that poses an immediate hazard to life or produces
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